[s-cars] 94 S4 hesitated

[Sam Clarkson]

Hi
94 S4 6 speed
I was driving hard(ish) up a hill the other day when suddenly a massive 
hesitation occurred, like someone had turned the key off, then on, then 
off, then on. This has repeated itself since from about 1.2 bar up on 
the digital boost/vac readout. Mid throttle driving is fine. All other 
gauges etc read OK.
I drove it again today, initially it did the same thing, then the boost 
readout went flat at 1.0 bar and the hesitation appears gone. The boost 
reads 1.0 bar no matter what speed/throttle position, whether full boot 
up hill or full overrun downhill or at idle. Power seems normal, 
everything drives smoothly.
All other readouts are as normal (fuel economy etc readouts)
What gives gurus?
Sam Clarkson
Edge to Edge
P.O. Box 27
National Park 2653
Ph 0800 800 SKI (754)
http://www.edgetoedge.co.nz